Jan trying to push a bicycle tire valve through a cola bottle cap.
We made a hole with a hand drill and widened it with screw drivers.
Pumping air in the bottle to test if it is sealed properly.
Air and water in the bottle; some water squirts out of it when trying
to remove the pump.
Pieter is about to remove the bottle cap. Note that the seal is not
completely good since there's clearly water leaking.
It's very hard to unscrew the cap fast enough ...
Conclusion: the bottle was not sealed well enough. We will try to remedy this in the second bottle by cutting just enough rubber from the bicycle tire around the valve such that when screwed tight, the bottle pushes the rubber against the cap. In our first bottle, we had cut away too much rubber, allowing water to escape.
Our rocket scientists at work: at the left, Pieter cutting the
rubber, at the right Jan making a hole in the bottle cap.
Pushing the valve through the cap requires some force, since the hole
in the cap must not be too large!
Glueing the rubber (to which the valve is connected) to the bottle cap.
Pieter on the right lifts the rubber with a screwdriver and Jan applies
glue.
Add water, start pumping ...
Trying to unscrew the bottle cap!
It appears we glued the cap to the bottle!
The only way to empty it is to push the valve, thus creating an irrigating
installation :-) If you look very closely, you can see a jet of water
droplets squirting out of the bottle.
Conclusion: the idea of cutting enough rubber out of the tire so that the bottle pushes it against the cap worked, but we also learned that glue glues and if you don't want glue to glue too much, then you should apply less glue in the future.